This electronic mosquito repellent schematic circuit diagram based on the 555 timer IC is a simple and useful mosquito repellent circuit . This mosquito repeller circuit generate an ultrasonic sound with a high output frequency that allows spreading mosquitoes within a wide radius . The circuit is quite simple and require few external components . The oscillation frequency is given by the value of the R1, R2 and C1 components and can be modified changing the value of components or replacing the R2 fixed resistor with a variable resistor ( potentiometer ) .
The actual oscillation frequency of this electronic mosquito repeller circuit is around 45 KHz ( 46.5 KHz) so you need to use a good high frequency speaker , you can use a piezo speaker .
The circuit can be supplied from a 9 V DC power supply . This repeller circuit can be used for almost any animal , it works on : cats , dogs , rats . Even if you don’t hear the sound generated by device don’t worry because the high frequency is less audible by the human ear .